Poster presented at SIAM CSE17 PP108 Minisymposterium: Software Productivity and Sustainability for CSE and Data Science Abstract: In this poster, we present software citation as a method to ensure credit for and identification, discovery, and reuse of software in scientific and engineering research. This poster documents efforts by the both the FORCE11 Software Citation Working Group (https://www.force11.org/software-citation-working-group) and WSSSPE working group on software credit (http://wssspe.researchcomputing.org.uk/). We discuss the six principles of software citation, related work, and key challenges/research directions, including suggestions for metadata necessary for software citation and some examples.